There are literaly hundreds of good sites out there, so I'll just give you these for now.

Key things to remember though - you must be completely comfortable using your camera in the dark! Most of the hard work is in the processing, there are 2 free stcking / processing softwares: IRIS and Deepskystacker...IRIS is the best of the 2, but more difficult to use at first. Deepsky stacker is very user friendly, but I dont think the results are as good. Both can be obtained as free downloads - google will take you to their respective sites.
Hope this helps, but if you have any questions feel free to contact me.
Cheers,
Paul.